I'm battling them right now. Went through flower, Harvested and now I'm back to Veg so I'm using Neem Oil. While I was in Flower I read about a Apple Cider Vinegar Mix and went that route. Don't do it lol, I swear they exploded and loved it.
If anything I think the next step for me if I still have them when I go to flower is Hot Pepper mix I read about (Don't feel like googling it right now). I forgot if it was Cayenne or Habanero but I think that would be the best way.
I've tried Dr. Zymes and it worked somewhat but it didn't fully take them out either.
Aphids are a nightmare lol. Good luck.